1. Department of Neurology, Oregon Health & Science University, Portland, OR 97239, USA,
2. Department of Neurology, Oregon Health & Science University, Portland, OR 97239, USA, Department of Veterans Affairs Medical Center, Portland, OR 97239 USA
3. Department of Medical Informatics and Clinical Epidemiology, Oregon Health & Science University, Portland, OR 97239, USA
4. Public Health and Preventive Medicine, Oregon Health & Science University, Portland, OR 97239, USA
5. National College of Naturopathic Medicine, Portland, OR 97201, USA